Senior Full Stack Engineer

Lucas Veloso Assa Galego

Scalable system architecture with JavaScript/TypeScript and AWS

TypeScriptReactNext.jsNode.jsAWSKubernetes
Let's talkLinkedIn

8+

Years of experience

90%

Bug reduction

94%

Performance improvement

Professional portrait of Lucas Veloso Assa Galego, Senior Full Stack Engineer

Status

Available for opportunities

Career
Professional Journey

Growth with measurable outcomes

Over 8 years building mission-critical systems in FinTech, HealthTech, and AI, with quantifiable technical impact at every stage.

Surgical Mapp | Medical Device Management

Current

Senior Full Stack Engineer

Jan 2026 - PresentBrazil
  • Drove end-to-end technical conception and architectural evolution of a complex digital ecosystem for the healthcare sector (Medical Devices/OPME).
  • Engineered an isolated frontend development layer (DevMode), decoupling business logic from the backend.−70% feature delivery time
  • Planned and executed migration of distributed microservices from PM2 to Docker/Kubernetes.+80% system availability
  • Championed quality-first culture through TDD, rigorous code reviews, and automated CI/CD.−90% production bugs

Freelancer

Senior Fullstack Engineer

Jan 2025 - Jan 2026
  • Full-stack delivery for complex digital transformation programs using React, Angular, and Node.js.
  • Architected containerized BFF microservices, decoupling modern frontends from legacy core systems.+80% modernization speed
  • Comprehensive testing strategies with Jest and Cypress in Agile environments.−92% regressions

Zup Innovation

Senior Frontend Engineer

Sep 2024 - Dec 2024
  • Led frontend engineering for the New Credit Gateway initiative with React, Angular, and TypeScript.
  • Integrated high-traffic interfaces within the Open Finance ecosystem with strict regulatory compliance.
  • Architected BFF microservices with Node.js connecting UI to core banking systems.

Youse Seguros

Senior Fullstack Engineer

Feb 2024 - Sep 2024
  • Digitized complex insurance workflows: quoting, purchasing, and claims processing.
  • Built resilient APIs with Node.js, NestJS, and AdonisJs integrated with insurance processing engines.
  • Optimized rendering, cache management, and TDD for frontend performance.+94% performance (Lighthouse/CWV)

Distrito

Senior Frontend Engineer

Feb 2022 - Feb 2024São Paulo, Brazil
  • Spearheaded large-scale architectural refactoring across three core AI-driven platform modules.+93% scalability and reliability
  • Drove cross-functional technical consensus and standardized automated testing practices.+86% deployment reliability

canibuild

Senior Fullstack Engineer

Jul 2021 - Feb 2022
  • Optimized the critical lot selection module with advanced caching mechanisms.+10% overall performance
  • Built backend microservices with Node.js/TypeScript integrating SQL Server and PostgreSQL.
  • Managed deployment across AWS infrastructure (ECS, EC2, S3, Lambda, SQS) ensuring high availability.

Peopleware Tecnologia

Mid Fullstack Engineer

Jun 2020 - Jul 2021Rio de Janeiro, Brazil
  • Architected micro-frontend system (React, Node.js, TypeScript) for CyberFinancial modernization.
  • Key role in international CyberCore migration (Mexico → Brazil) with regional compliance adaptation.
  • Implemented CI/CD automation with Jenkins, significantly reducing release incidents.

Supritecno

Junior Fullstack Engineer

Jan 2017 - Jun 2020Rio de Janeiro, Brazil
  • Developed hospital innovation management systems with responsive, effective user interfaces.
  • Adopted TypeScript for static typing to enhance code reliability and minimize production errors.
Technical Expertise

Skills by domain

A consolidated stack built over 8+ years, organized by area of expertise with engineering principles as the foundation.

Architecture

Design of decoupled, resilient, domain-oriented systems.

DDDSOLIDTDD
  • Microservices
  • Backend-for-Frontend (BFF)
  • Event-Driven Architecture
  • Monorepos
  • Micro-frontends
  • Clean Architecture

Cloud & DevOps

Cloud-native infrastructure focused on availability and automation.

  • AWS (ECS, EC2, S3, Lambda, SQS)
  • Docker
  • Kubernetes
  • CI/CD (GitHub Actions, Jenkins)
  • Observability (Datadog, CloudWatch)

Fullstack

End-to-end development with excellence in frontend and backend.

  • Node.js / NestJS / Express / AdonisJs
  • React / Next.js / Redux
  • TypeScript
  • RESTful APIs
  • PostgreSQL / MongoDB / DynamoDB / SQL Server
Technical Leadership

Driving high-quality standards

Beyond code, I lead by implementing practices that elevate the entire team's engineering, with measurable results in quality and velocity.

Automated Testing

Establishing comprehensive testing pipelines as a quality gate.

  • TDD as standard practice across squads
  • Coverage with Jest, Cypress, and integration tests
  • Measurable reduction of bugs and regressions in production

Rigorous Code Review

Code governance that elevates the technical standard of the entire team.

  • Reviews focused on architecture, not just syntax
  • SOLID, coupling, and testability checklists
  • Technical mentorship during the review process

Best Practices Dissemination

Evangelizing architectural patterns and optimized workflows.

  • ADR documentation and integration patterns
  • DDD and Clean Architecture workshops
  • Developer-centric solutions like DevMode to accelerate cycles
Technical Case Studies

Complex problems, measurable solutions

Case studies in Challenge → Technical Action → Measurable Result format, demonstrating the ability to solve high-complexity problems.

Surgical Mapp | HealthTech

DevMode Layer: Frontend Decoupling

−70% cycle time
Next.jsNestJSClean ArchitectureAWS S3
Challenge

The frontend was tightly coupled to the backend, blocking parallel development and increasing feature delivery time in critical sprints.

Technical Action

Architected and implemented an isolated development layer (DevMode) that decouples business logic from the backend, enabling independent frontend iteration with parameterized mocks and dynamic storage routing (local disk ↔ AWS S3).

Result

70% reduction in feature delivery time, measured by sprint cycle time, with significantly optimized team workflows.

Surgical Mapp | Distributed Infrastructure

PM2 → Kubernetes Migration

+80% availability
KubernetesDockerMicroservicesMonorepo
Challenge

Tightly integrated HTTP microservices shared a unified database and ran on PM2, with cross-system communication bottlenecks and low availability.

Technical Action

Planned and executed technical migration to Docker containers orchestrated via Kubernetes, with Monorepo governance and decoupled microservices to eliminate processing waste.

Result

80% improvement in system availability and resolution of inter-service communication bottlenecks.

Freelancer | Digital Transformation

BFF for Legacy Modernization

+80% modernization speed
BFFDockerReactNode.js
Challenge

Modern frontends needed to integrate with legacy core systems without rewriting the entire existing infrastructure.

Technical Action

Architected containerized Backend-for-Frontend microservices with Docker, establishing a secure translation layer between modern UI and legacy APIs.

Result

80% acceleration in the modernization process compared to legacy deployment cycles, with 92% regression reduction via TDD.

Youse Seguros | FinTech

Core Web Vitals Optimization

+94% load time
ReactReduxTDDPerformance
Challenge

Critical insurance flows (quoting, purchasing, claims) had elevated load times impacting conversion and user experience.

Technical Action

Implemented rigorous TDD, optimized React component rendering, refactored local cache strategies, and conducted performance-focused code reviews.

Result

94% improvement in load times per Lighthouse and Core Web Vitals metrics.

Projects

Products built from scratch

Production-grade full stack applications demonstrating scalable architecture, AI integration, and engineering excellence.

SurgicalMapp Academy

Multi-tenant LMS platform for surgical and medical training (B2B HealthTech/EdTech), featuring parent/branch organization hierarchy, learning paths, and Assisted Practice: formal logging and sign-off of supervised hands-on procedures.

  • Hierarchical multi-tenancy (MASTER/SUB organizations) with full per-tenant data isolation and a content approval flow between parent and branch orgs
  • Four-role RBAC (Platform Admin, Org Admin, Educator, Student) with an access gate driven by content subscriptions for users, teams, and organizations
  • Assisted Practice: supervised procedure logging with educator sign-off, wired into progress tracking and certificates with publicly verifiable codes
  • Clean Architecture across domain modules (IAM, Learning, Titles) on Express + TypeORM, with Jest unit/integration suites and Playwright E2E coverage
  • Deployed on EC2 with PM2, PostgreSQL 16 via Docker Compose, and media uploads on S3 with presigned URLs
Next.jsReact 19ExpressTypeORMPostgreSQLAWS S3PlaywrightMulti-tenant

WppCRM

Multi-tenant BPO operational CRM for WhatsApp customer service with AI, designed for high-volume operations with real-time inbox and intelligent agent management.

  • Multi-tenant architecture with roles (super-admin, manager, agent) and per-organization isolation
  • WhatsApp Web-style inbox with SSE for real-time messaging via WAHA Plus
  • Encrypted AI credentials (AES-256-GCM), API tokens, and MCP catalog for AI agents
  • 78 automated tests (Vitest) covering auth, webhooks, ingestion, and UI components
Next.jsExpressPostgreSQLPrismaWAHASSEDockerVitest

MCP Data Analyst

Logistics BI platform with analytical dashboard and MCP-powered conversational chat, capable of querying data in natural language and generating dynamic visualizations.

  • MCP server with run_sql tool for secure queries against logistics PostgreSQL
  • Real-time WebSocket chat with Google Gemini and dynamic Recharts visualizations
  • Dashboard with KPIs, SLA, driver rankings, and warehouse activity metrics
  • Decoupled architecture: Next.js frontend, Express/TypeORM API, and dedicated MCP server
Next.jsExpressTypeORMPostgreSQLMCPWebSocketGoogle GeminiRecharts

Astro Raiders

Browser-based 3D multiplayer game with realistic physics, online combat, and procedural map generation, a full game dev experience with Three.js and real-time networking.

  • 3D engine with Three.js, Rapier3D collision physics, and Vite + TypeScript
  • Socket.IO multiplayer: lobbies, chat, position sync, and PvP combat
  • Inventory, loot, projectiles, stamina, hazards, and deterministic seed-based maps
  • Node.js/Express backend with authoritative state snapshots and shared item collection
Three.jsRapier3DTypeScriptViteSocket.IOExpressWebGLMultiplayer

4Trucker

Full stack application built for the CCR & Shawee hackathon, featuring a REST API, web frontend, and mobile app for the road transport ecosystem.

  • Three-tier architecture: Node.js API, React web frontend, and Expo mobile app
  • Database layer with Knex migrations and seeds for reproducible setup
  • End-to-end solution delivered in a tight hackathon timeframe
  • 83%+ of the codebase in TypeScript, showing early adoption of static typing
ReactExpoNode.jsTypeScriptKnexREST APIMobile
View repository
Contact

Let's build something high-impact

Open to senior opportunities in software architecture, technical leadership, and full stack engineering.

Interested in discussing how I can contribute to your team?

lucas.velloso2017@gmail.com
+55 21 99554-5816Rio de Janeiro, BrazilLinkedIn